infiltrate meaning and definition

INFILTRATE verb

Definition of infiltrate (verb)

1. cause (a liquid) to enter by penetrating the interstices
2. enter a group or organization in order to spy on the members
   • "The student organization was infiltrated by a traitor"
   • synonyms: penetrate
3. pass into or through by filtering or permeating
   • "the substance infiltrated the material"
4. pass through an enemy line; in a military conflict
   • synonyms: pass through